Technical Data Sheet - Nurasakti

1 Technical data Sheet Si-COAT 570 RTV Silicone High Voltage Insulator Coating Copyright 2004, CSL Silicones Inc. All trademarks registered. All rights reserved. Si-COAT 570 Page 1 of 6 RTV Silicone High Voltage Insulator Coating Technical data Sheet Reviewed 04-Jan-05 Copyright 2004, CSL Silicones Inc. All trademarks registered. All rights reserved 1 Introduction Si-COAT 570 High Voltage Insulator Coating (HVIC) is a room temperature vulcanizing (RTV) silicone product. Unlike competitive products, it is supplied ready-to-use without the need of additional thinning or excessive mixing/shaking before use. Si-COAT 570 HVIC is based on extensive research and development work that lead to the award of a patent. The basis of the Si-COAT 570 patent is the optimally-sized alumina trihydrate (ATH) particle and the optimum concentration of the ATH ingredient, discovered by the engineers and chemists at CSL Silicones Inc.

2 The presence of ATH in the formulation of the HVIC is necessary to protect the coating from the damaging effects of tracking under high electrical activity along the surface of the coating. It is essential that the ATH particle be optimally-sized and in an optimum concentration in order to promote long-term hydrophobicity of the coating. The downside to the presence of ATH is the potential for the filler to settle during storage and transportation. In order to alleviate the problem, competitive coatings rely on a very fine particle size ATH (below 1 micron diameter). However, this fine particle size is far from the optimum size (13 microns) patented by CSL. By virtue of other key ingredients and a unique manufacturing process, the engineers and chemists behind Si-COAT 570 have achieved a finished product in which the larger 13 micron ATH particle will not settle.

3 Hence, excessive agitation prior to application is unnecessary, making Si-COAT 570 one of the easiest HVICs to use. Apart from its very long life and ease-of-use qualities, Si-COAT 570 was the first to introduce the benefit of strong adhesion to the insulator surface. It is ideally suited for unprimed application to glass, porcelain and polymer (silicone and EPDM) insulators under all voltage conditions from distribution to very high voltage. Over its greater than 15 years of service history, Si-COAT 570 has distinguished itself from its competition by virtue of flawless performance without a single failure of any type. That is far more than any competitor can claim of their HVIC. For ultimate suppression of leakage current and an untarnished service life greater than that of any other HVIC, turn to Si-COAT 570 by CSL Silicones Inc.

4 2 Product Description A single component, RTV, moisture cure, high-build polysiloxane coating providing excellent long-term hydrophobicity, hydrophobicity recovery, electrical characteristics and UV tolerance leading to suppression of leakage current, reduction of pollution related flashover risk and a long service life. 3 Intended Uses Suitable for use on both new insulators and old insulators to be refurbished. Can be used, unprimed, on a variety of insulator substrates including glass, porcelain, HTV silicone, LSR type silicone and EPDM. Further suitable as a refresh coating over old silicone HVICs provided the old HVIC is properly cleaned and still displays strong adhesion to the insulator surface. Can be used in a wide variety of pollution environments including, but not limited to, salt spray, salt fog, industrial (cement dust, fly ash, carbon black, acid emissions, etc.)

5 And desert sand. Designed for use in AC and DC systems, in substations of all voltage levels and on transmission lines under all voltage conditions ranging from low distribution voltages to very high transmission voltages. 4 Practical Information Color Gloss Level Percent Solids Typical Thickness Standard color is grey. Custom colors may be available dependent on formulation requirements. Semi-gloss 57% by volume 70% by weight to mil (381 to 508 micron) dry film thickness (DFT) Equivalent to mil (660 to 890 micron) wet film thickness (WFT) Si-COAT 570 Page 2 of 6 RTV Silicone High Voltage Insulator Coating Technical data Sheet Reviewed 04-Jan-05 Copyright 2004, CSL Silicones Inc. All trademarks registered. All rights reserved Theoretical Coverage Practical Coverage Method of Application Application Temperature Range Drying Time DFT mils (381 ) mils (508 ) sq.

6 Ft per US gal sq. ft per lb sq. m per liter sq. m per kg Allow appropriate loss factor and calculate as follows: Practical Coverage = Theoretical Coverage x [100% - Loss%] Airless spray, brush or dip 41 to 140 F (5 to 60 C) [ambient] 41 to 266 F (5 to 130 C) [substrate] Skin-over Time: 15 minutes (at standard conditions*) Tack-free Time: 30 minutes (at standard conditions) Cure Through: 6 hours (at standard conditions) Full Physical Characteristics: 7 days (at standard conditions) 5 Regulatory data Flash Point Product Weight VOC 100 F (38 C) lb/US gallon ( kg/liter) lb/US gallon ( g/liter) UNCURED Appearance Thick paint Viscosity 1,000 300 cP Cure System Neutral, moisture cure CURED At standard conditions for 7 days Dielectric Strength V/mil ( kV/cm) [ASTM D149] Volume Resistivity x 1016.

7 In ( x 1016 .cm) [ASTM D257] Surface Resistivity x 1015 .in ( x 1015 .cm) [ASTM D257] Dissipation Factor at 100 Hz: ; at 100 kHz: [ASTM D150] Dielectric Constant at 100 Hz: ; at 100 kHz: [ASTM D150] Tracking Wheel Withstand >1000 hrs. Dry Arc Resistance track: 180 sec; burn out: 450 sec Temperature Stability -40 to 480 F (-40 to 250 C) 6 Physical Properties Thermal Expansion Coefficient ( x 10-4 cm/cm. C) * Standard conditions are 77 F (25 C) and 50% relative humidity Si-COAT 570 Page 3 of 6 RTV Silicone High Voltage Insulator Coating Technical data Sheet Reviewed 04-Jan-05 Copyright 2004, CSL Silicones Inc. All trademarks registered. All rights reserved Thermal Conductivity F ( x 10-4 C) Loss Tangentat 60 Hz x 10-3 Water Repellency Angle 120 degrees UV Accelerated Weathering No degradation [ASTM G53 Series, 5000 hours] 7 Surface Preparation All surfaces to be coated should be free of dirt, dust, grease, oil, release agents, curing compounds, and other foreign matter including frost.

8 In addition, prior to applying the coating, all surfaces must be dry. Such precaution will ensure proper adhesion of the Si-COAT 570 coating to the insulator surface. High-pressure water washing is the suggested method for cleaning the insulator surface. The recommended pressure washing parameters are 3,000 psi @ 8 10 gallons per minute (210 kg/cm2 @ 30 40 liters per minute). Insulators contaminated with cementitious material should be cleaned with a dry abrasive cleaner such as crushed corncob or walnut shells mixed with limestone. For insulators covered in silicone or hydrocarbon grease, remove the bulk of the grease with a dry abrasive cleaner as above, or by hand wiping with a rag. Once the bulk of the grease has been removed, the surface should be wiped clean using an oil-free solvent such as acetone.

9 Isopropyl alcohol is suggested for the final wipe and coating should commence once the insulators are dry. If for whatever reason the Si-COAT application is delayed after cleaning of the insulator, the insulator must be re-cleaned. 8 Coating Application Mixing Application Airless Spray Si-COAT 570 is supplied as a one-part, ready-to-use coating. It is normal, however, during shipment or extended storage, for carrier solvent to rise to the top of the container. Upon opening of the container, mix by hand or by power agitator until an even consistency of coating is obtained. All surfaces should be clean and dry prior to application. The coating should be applied in a manner that prevents runs, sags, drips, spills, etc. and that completely covers surfaces without holidays.

10 The temperature of the surface to be coated should be between 41 and 122 F (5 and 50 C) and environmental temperature should be at least 5 F (3 C) above the dew point prior to and during application. All areas particularly prone to corrosion such as the caps and pins of insulator discs can also be coated to provide added protection and a uniform monolithic surface. The entire insulator should be coated with a minimum mil (381 micron) to mil (508 micron) DFT of Si-COAT 570. The maximum advisable DFT of Si-COAT 570 is 50 mil (1,270 micron). Recommended - Tip sizes to range from 17 to 21 thou (432 to 533 micron) with a 6 to 10 inch (15 to 25 cm) fan at 1 ft (30 cm) distance - Pump pressure ratio of 40:1 - Total output fluid pressure at spray tip not less than 2,000 psi (141 kg/cm2) - minimum in ( cm) ID, maximum 50 ft (15 m) length spray line - See recommended spray apparatus in Section 9 Si-COAT 570 Page 4 of 6 RTV Silicone High Voltage Insulator Coating Technical data Sheet Reviewed 04-Jan-05 Copyright 2004, CSL Silicones Inc.